"P.F. Chang's takes these matters very seriously and is currently investigating the situation, working with the authorities to learn more. We will provide an update as soon as we have additional information," said Anne Deanovic, a spokeswoman for P.F. Chang's.

Officials with the Secret Service could not immediately be reached for comment. The Secret Service is the U.S. federal law enforcement agency that typically takes the lead on investigating credit card breaches.

In a similar case, discount retailer Target Corp reported last year in December that hackers had stolen data from up to 40 million credit and debit cards of shoppers who visited its stores during the first three weeks of the holiday season.